Which of these describes a computer's operating system?

Question $2$ options:

It allows application developers to write programs without having to handle low$-$level details of accessing system resources.

All of the other choices $($except "None of the other choices"$)$

It is the interface between the user and the computer's hardware.

It manages the way applications access the computer's resources.

None of the other choices.

It allows for multiple users with different levels of access ot the computer and its resources.